The aircraft is made from bolted-together aluminum tubing, with the flying surfaces covered in Dacron sailcloth. The Sidewinder differs from the X1 in having flaps. Its 30 ft (9.1 m) span wing is cable-braced from an inverted "V" kingpost mounted on top of the wing. The landing gear has suspension on all wheels and features a steerable nosewheel, plus main wheel brakes. The pilot is accommodated on an open seat, partially enclosed by a fibreglassfairing with a windshield. The standard engine provided was the Kawasaki TA 440Asnowmobile powerplant of 37 hp (28 kW).[1]